JP4482362B2 - Display device - Google Patents

Description

  The present invention relates to a display device as a flat display device.

2. Description of the Related Art In recent years, various flat display devices that employ a flat thin display panel such as a plasma display panel, a liquid crystal display panel, and an organic electroluminescence panel have been developed.
FIG. 1 shows an example of the overall configuration of a display device incorporating the display panel.

As shown in the figure, the housing that accommodates the display panel 1 includes a front frame 6 in which a front cover made of glass or the like is disposed in an opening, and a rear cover 7.
The display panel 1 is held by adhering to the front surface of the chassis 3 made of aluminum alloy or the like via a double-sided adhesive tape 5, and a drive circuit for driving the display panel 1 is mounted on the rear surface side of the chassis 3. A plurality of circuit blocks (circuit boards) 2 such as a scan circuit board and a drive circuit board on which a power supply circuit for supplying power to the drive circuit is mounted.

FIG. 2 shows a connection structure between the display panel 1 and the chassis 3 in the conventional example of such a flat display device.
As shown in the figure, the display panel 1 is constituted by bonding a front glass substrate 1A and a rear glass substrate 1B through a discharge space 1C, and a circuit for driving the display panel 1 is provided. A substrate 2 is mounted via a chassis 3.

The chassis 3 is a plate-shaped member made of a metal such as an aluminum alloy having good thermal conductivity, and the display panel 1 and the circuit board 2 are electrically connected via a flexible cable 4. The display panel 1 is fixed by a double-sided adhesive tape 5 attached to the outer surface of the rear glass substrate 1B of the display panel 1 (the rear surface of the display panel 1).
As described above, in a flat display device, a technique using a double-sided adhesive tape 5 as means for fixing the chassis 3 and the display panel 1 is known (for example, see Patent Document 1).
Japanese Utility Model Publication No.5-11183

As described above, the chassis 3 and the display panel 1 are bonded together by sandwiching the double-sided adhesive tape 5 between them, and the bonded state is as shown in the schematic diagram of FIG.
However, the display panel 1 and the chassis 3 may be distorted and warped as shown in the schematic diagram of FIG. 4 during the manufacturing process. That is, when the display panel 1 and the chassis 3 are bonded together with the double-sided adhesive tape 5 in a state where the display panel 1 and the chassis 3 are distorted and warped (the state shown in FIG. 4), the space between the display panel 1 and the chassis 3 is obtained. A gap 8 is generated.

  The gap 8 becomes a factor that causes the display panel 1 to drop off from the chassis 3 and a factor that prevents the heat released from the display panel 1 from being uniformly dissipated. For this reason, the double-sided pressure-sensitive adhesive tape 5 has a sufficient thickness so as to compensate for the gap 8 generated by distortion or warping of the display panel 1 or the chassis 3.

When the thickness of the double-sided pressure-sensitive adhesive tape 5 increases, the thermal conductivity of the double-sided pressure-sensitive adhesive tape 5 deteriorates. For this reason, when the double-sided pressure-sensitive adhesive tape 5 having an increased thickness is used, it is difficult to ensure sufficient heat dissipation of the display panel 1.
Therefore, in order to ensure heat dissipation of the display panel 1, the double-sided pressure-sensitive adhesive tape 5 contains a substance having high thermal conductivity (silicon or the like).

However, if a material having high thermal conductivity is included in the double-sided pressure-sensitive adhesive tape 5, the cost of the double-sided pressure-sensitive adhesive tape 5 is increased, and the weight of the double-sided pressure-sensitive adhesive tape 5 is increased to prevent weight reduction of the product.
In addition, when the double-sided adhesive tape 5 is applied, air enters the gap between the display panel 1 and the chassis 3 to reduce the adhesion, which hinders the heat dissipation of the display panel 1. It was.

Further, although the display panel 1 may be peeled off from the chassis 3 for repair of the display device or the like, it is known that the double-sided adhesive tape 5 is relatively difficult to peel off. In addition, the double-sided adhesive tape 5 is affixed to substantially the entire area between the display panel 1 and the chassis 3 and has a large adhesion area.
For this reason, it takes a relatively long time to remove the display panel 1 from the chassis 3 at the time of repair or the like, which hinders improvement of serviceability in the repair.

  The problem to be solved by the present invention is that it is difficult to ensure the adhesion between the panel and the chassis, which occurs in the above-described prior art, and it is difficult to maintain the strength so that the panel does not fall from the chassis. Examples are the problem, difficulty in securing heat dissipation from the panel, difficulty in reducing costs and reducing mitigation, and difficulty in improving serviceability in repairs. .

The display device according to claim 1 is a display device including a display panel and a chassis attached to a back surface of the display panel, and the panel attachment surface of the chassis has an uneven surface formed by drawing or molding. And the uneven surface of the chassis has a plurality of protrusions having a flat top surface, and a frame-shaped partition wall surrounding the periphery of the protrusions,
Further, the portion surrounded by the partition wall between the uneven surface of the chassis and the display panel is filled with a thermally conductive gel substance .

Hereinafter, embodiments of a display device according to the present invention will be described in detail with reference to the drawings.
FIG. 5 is a perspective view showing the overall configuration of the display device according to the embodiment of the present invention, and FIG. 6 is an exploded perspective view showing a connection structure between the panel and the chassis.

  As shown in FIG. 5, the housing that accommodates the display panel 11 in the display device 10 includes a front frame 6 in which a front cover made of glass or the like is disposed in an opening, and a rear cover 7.

The display panel 11 is held by adhering to the outer periphery of the panel mounting surface 13 of the chassis 12 made of an aluminum alloy or the like via a double-sided adhesive tape 19, and the display panel 11 is driven to display on the rear surface side of the chassis 12. A plurality of circuit blocks (circuit boards) 3 such as a scan circuit board having a drive circuit for mounting and a drive circuit board having a power supply circuit for supplying power to the drive circuit are attached.
The chassis 3 is a plate-like member made of a metal such as an aluminum alloy having good thermal conductivity, and the display panel 11 and the circuit board 2 are electrically connected via a flexible cable or the like (not shown). .

  As shown in FIG. 6, the panel mounting surface 13 of the chassis 12 has an uneven surface 14 formed by drawing or molding, and a thermally conductive gel (viscosity) between the uneven surface 14 and the display panel 11. ) The material 15 is filled, and a double-sided adhesive tape 19 is interposed between the outer peripheral portions 17 and 18 in the facing gap between the display panel 11 and the chassis 12.

The uneven surface 14 of the chassis 12 includes a plurality of protrusions 21 having a flat top surface 21 </ b> A, a frame-shaped partition wall 23 surrounding the periphery of the protrusion 21, and a recess 24 formed by the protrusion 21 and the partition wall 23. And have.
As an example, the protruding portion 21 has a columnar shape such as a columnar shape or a prismatic shape, and each top surface 21A is flat and formed flush with each other.

The partition wall portion 23 is formed in a substantially rectangular shape along the outer peripheral portion 18 in the vicinity of the outer peripheral portion 18 of the chassis 12, and the top surface 23 </ b> A is formed flush with the top surface 21 </ b> A of the protruding portion 21.
Thereby, the display panel 11 is satisfactorily brought into contact with the top surface 21A of the protruding portion 21 and the top surface 23A of the partition wall portion 23 without a gap.

  By forming the concavo-convex surface 14 on the chassis 12, the concave portion 24 of the concavo-convex surface 14 is used as a flow path for the gel-like substance 15, and the fluidity of the gel-like substance 15 is enhanced. Can be distributed efficiently.

  In addition, since only the gel-like substance 15 needs to be filled in the concave portion 24 of the uneven surface 14, the amount of the gel-like substance 15 used can be suppressed. Thereby, the cost of the display apparatus 10 can be suppressed and weight reduction can be achieved.

  Further, by enclosing the plurality of protrusions 21 with the partition wall 23, that is, a rectangular frame, the thermally conductive gel substance 15 is formed in the recess 24 of the uneven surface 14 in the portion surrounded by the partition wall 23. Filled. Therefore, the area | region filled with the gel-like substance 15 is ensured by the partition part 23, and the filling property of the gel-like substance 15 can further be improved.

  The thermally conductive gel substance 15 is a viscous substance having thermal conductivity. The thermally conductive gel substance 15 is a synthetic oil having a dimethylpolysiloxane structure, and, for example, “SH2000 oil” (silicon oil) manufactured by Toray Dow Kosing Silicon Co., Ltd. is applicable. This gel-like substance 15 is a substance having excellent thermal conductivity and excellent adhesiveness.

  By filling the heat conductive gel material 15 between the uneven surface 14 of the chassis 12 and the display panel 11, the uneven surface 14 is not filled. Thereby, the display panel 11 and the chassis 12 are brought into close contact with each other without an air layer interposed between the display panel 11 and the chassis 12.

  A double-sided adhesive tape 19 is interposed along the outer peripheral portions 17 and 18 outside the partition wall portion 23 in the gap between the display panel 11 and the chassis 12.

The double-sided adhesive tape 19 is a double-sided adhesive tape formed in a substantially rectangular frame body by a pair of double-sided adhesive tape pieces 19A and a pair of double-sided adhesive tape pieces 19B.
The pair of double-sided adhesive tape pieces 19A is a tape piece provided along a pair of sides 18A in the length direction of the outer peripheral portion 18 of the chassis 12 formed in a rectangular shape.
The pair of double-sided adhesive tape pieces 19B are tape pieces provided along a pair of sides 18B in the width direction of the outer peripheral portion 18 of the chassis 12 formed in a rectangular shape.

One adhesive surface of the double-sided adhesive tape 19 is adhered to the outer peripheral portion 17 of the display panel 11, and the other adhesive surface of the double-sided adhesive tape 19 is adhered to the outer peripheral portion 18 of the chassis 12.
Therefore, the outer peripheral portion 17 of the display panel 11 and the outer peripheral portion 18 of the chassis 12 are bonded with the double-sided adhesive tape 19.
Thereby, it becomes possible to adhere the display panel 11 to the chassis 12 more firmly, and the adhesive strength can be maintained so as to prevent the display panel 11 from dropping from the chassis 12 due to vibration or the like.

Further, since the double-sided adhesive tape 19 is merely interposed along the outer peripheral portions 17 and 18 of the display panel 11 and the chassis 12, the amount of the double-sided adhesive tape 19 used can be reduced.
In addition, the double-sided pressure-sensitive adhesive tape 19 is a normal double-sided pressure-sensitive adhesive tape and is easily available.
Thus, the cost of the display apparatus 10 can be suppressed by using the normal double-sided adhesive tape 19 that is easily available and reducing the amount of the double-sided adhesive tape 19 used.

Next, a modified example of the display device 10 according to the embodiment of the present invention will be described.
FIG. 7 is an exploded perspective view showing a connection structure between a panel and a chassis in a modified example.
In the above-described embodiment, the example in which the outer peripheral portion 17 of the display panel 11 and the outer peripheral portion 18 of the chassis 12 are bonded with the double-sided adhesive tape 19 has been described. However, by giving the gel-like substance 15 adhesiveness, FIG. It is also possible to delete the double-sided adhesive tape 19 as shown in FIG.

Thereby, the same effect as the above-described embodiment can be obtained.
Furthermore, since the double-sided pressure-sensitive adhesive tape 19 is not used, the operation of bonding the display panel 11 to the chassis 12 can be further simplified, so that productivity can be further increased.
In addition, since the double-sided adhesive tape 19 can be made unnecessary, the cost can be suppressed.

  As described above in detail, the display device 10 according to the present embodiment includes the display panel 11 and the chassis 12 attached to the back surface of the display panel, and the panel attachment surface 13 of the chassis 12 is drawn. Or it has the uneven surface 14 by a shaping | molding, and is filled with the heat conductive gel-like substance between the said uneven surface 14 and the display panel 11. FIG.

Thereby, it becomes possible to adhere each member 11 and 12 so that a gap (that is, an air layer) is not generated between the display panel 11 and the chassis 12, and the display panel 11 and the chassis 12 are in close contact with each other. Can be secured.
By ensuring the adhesion between the display panel 11 and the chassis 12, sufficient heat dissipation from the display panel 11 to the chassis 12 can be ensured.

  In addition, by filling the display panel 11 and the chassis 12 with a thermally conductive gel substance 15, the double-sided adhesive tape contains a highly thermally conductive substance (such as silicon) as in the prior art. It is not necessary to interpose this double-sided adhesive tape between substantially the entire area between the display panel 11 and the chassis 12.

  If a double-sided adhesive tape contains a material with high thermal conductivity (such as silicon), the cost of the double-sided adhesive tape increases and the weight of the double-sided adhesive tape increases, but according to this embodiment, the above substance is included. Therefore, the cost can be reduced and the weight can be reduced.

  Further, when the display panel 11 is peeled off from the chassis 12 for repair or the like, the display panel 11 can be easily peeled off from the chassis 12 without taking time, and the serviceability can be improved.

It is a disassembled perspective view which shows the conventional display apparatus. It is sectional drawing which shows the conventional display apparatus. It is a schematic diagram (perspective view) which shows the state which adhered the panel and chassis of the conventional display apparatus. It is a schematic diagram (perspective view) showing a state where a gap is generated between a panel of a conventional display device and a chassis. It is a disassembled perspective view which shows the display apparatus which concerns on embodiment of this invention. It is the disassembled perspective view which showed the connection structure of the panel and chassis in the display apparatus which concerns on embodiment of this invention. It is the disassembled perspective view which showed the connection structure of the panel and chassis in the modification of the display apparatus which concerns on embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Display apparatus 11 Panel 11A Panel back surface 12 Chassis 14 Concavity and convexity surface 15 Thermally conductive gel-like substance 17 Panel outer periphery 18 Chassis outer periphery 19 Double-sided adhesive tape 21 Protruding portion 21A Top surface of protruding portion 23 Partition portion

Claims (2)

A display device comprising a display panel and a chassis attached to the back of the display panel,
The chassis panel mounting surface has an uneven surface by drawing or molding,
And the uneven surface of the chassis is
A plurality of protrusions having a flat top surface and a frame-shaped partition wall surrounding the periphery of the protrusions;
Furthermore, a heat conductive gel-like substance is filled in a portion surrounded by the partition wall between the uneven surface of the chassis and the display panel . The display device according to claim 1 , wherein a double-sided adhesive tape is interposed outside the partition wall in a facing gap between the display panel and the uneven surface of the chassis .